Curved Grid Charging Device for Photoconductive Drum
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Solution Overview
Problem
Current charging methods for image forming apparatuses, which involve a grid with a curvature surface facing a photoconductive drum, are limited in achieving higher resolutions, higher speeds, and further miniaturization due to constraints in adjusting the distance between the drum and the grid effectively.
Innovation Solution
A charging device with a grid having a curvature surface that can be adjusted in both curvature and position in the sub-scanning direction of the photoconductive drum, utilizing a carrying member with a fixed curvature shape and a position adjusting mechanism to precisely control the distance and position of the grid relative to the drum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a grid with a curvature surface is used to charge the photoconductive drum, then charging efficiency is improved, but the ability to precisely adjust the distance between the drum and grid is limited
Solution Approach 1:
The invention makes the grid position adjustable in the sub-scanning direction through a position adjusting mechanism. The grid can be moved along the sub-scanning direction to precisely control the distance between the curvature surface and the photoconductive drum, transforming a static structure into a dynamic one that adapts to different charging requirements.
Solution Approach 2:
The charging device is divided into functionally independent components: the grid assembly with curvature surface, the carrying member that supports the grid, and the position adjusting mechanism. This segmentation allows each component to be optimized independently and facilitates precise positional control of the grid relative to the drum.
2Productivity
If the distance between the photoconductive drum and grid is adjusted to improve charging efficiency, then higher resolutions and speeds can be achieved, but the device complexity increases
Solution Approach 1:
The position adjusting mechanism serves multiple functions: it adjusts the grid position in the sub-scanning direction, maintains the curvature shape of the grid, and enables precise distance control. This multi-functionality reduces the need for separate mechanisms and minimizes overall device complexity while achieving high productivity.
3Device complexity
If the grid position is fixed, then the device structure is simple, but the charging efficiency cannot be optimized for higher resolutions and speeds
Solution Approach 1:
The grid assembly is designed with dynamic positioning capability through the position adjusting mechanism, allowing the grid to be moved to optimal positions for different charging requirements. This dynamic feature enables charging efficiency optimization without requiring complete structural redesign, maintaining relative simplicity while improving performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution allows for improved charging efficiency, enabling higher resolutions, higher speeds, and further miniaturization of image forming apparatuses by accurately adjusting the distance and position of the grid, thus enhancing the charging process.
Implementation Method 1
a charging method has been adopted which places a curvature surface to face an outer circumferential surface of a photoconductive drum using a grid having the curvature surface in a charging device, charges the photoconductive drum
Data Source
AI summary
A charging device which includes a grid that has a curvature surface placed to face an outer circumferential surface of a photoconductive drum; a carrying member that carries the grid in a portion having a curvature to form the curvature surface of the grid; and position adjusting mechanisms that moves a position of the carrying member to adjust a position of the grid in a sub-scanning direction of the photoconductive drum, an imaging cartridge and an image forming apparatus having the same.